The main conference (11th-12th July) takes place at TUM Garching Campus: goo.gl/maps/kYnQimB6qaXRBg2v5 which is easily accessible from central Munich in 27 minutes by underground (U6 from Sendlinger Tor to to Garching, Forschungszentrum).
The tutorial and Learn2Reg challenge on Sunday (10th July) will be located at TranslaTUM (Klinikum rechts der Isaar) in central Munich goo.gl/maps/UyP4PiHNa67Qfdkd8
For local train travel there is a special flat-rate offer in July for 9€ throughout Germany (excluding high-speed trains, e.g. IC, ICE). See www.bahn.com/en/offers/regional/9-euro-ticket-en for more details.